Comment 15 for bug 1654144

We have also OpenStack deployment where external network has no availability zone, and we get the same error with 2.2.beta4

06:13:51 DEBUG juju.cloudconfig.instancecfg instancecfg.go:825 Setting numa ctl preference to false
06:13:51 DEBUG juju.service discovery.go:63 discovered init system "systemd" from series "xenial"
06:13:51 DEBUG juju.provider.openstack provider.go:1005 openstack user data; 2484 bytes
06:13:51 DEBUG juju.provider.openstack provider.go:1017 using network id "5c7cd500-c581-4491-86fa-af95a71e8c18"
06:13:51 DEBUG goose <autogenerated>:22 performing API version discovery for "https://lab.openstack.example.com:9696/"
06:13:51 DEBUG goose <autogenerated>:22 discovered API versions: [{Version:{major:2 minor:0} Links:[{Href:http://lab.openstack.example.com:9696/v2.0 Rel:self}] Status:CURRENT}]
06:13:58 INFO juju.provider.openstack provider.go:1141 trying to build instance in availability zone "nova"
06:14:22 INFO juju.provider.openstack provider.go:1184 started instance "92b9c8bc-fa5c-4eee-ad1e-5b9dffb5e229"2
06:14:22 DEBUG juju.provider.openstack provider.go:1188 allocating public IP address for openstack node
06:14:24 INFO cmd bootstrap.go:490 bootstrap failed but --keep-broken was specified so resources are not being destroyed.
When you have finished diagnosing the problem, remember to clean up the failed controller.
See `juju kill-controller`.
ERROR failed to bootstrap model: cannot start bootstrap instance: cannot allocate a public IP as needed: could not find an external network in availablity zone
06:14:24 DEBUG cmd supercommand.go:459 error stack:
github.com/juju/juju/provider/openstack/networking.go:168: could not find an external network in availablity zone
github.com/juju/juju/provider/openstack/provider.go:1190: cannot allocate a public IP as needed
github.com/juju/juju/provider/common/bootstrap.go:185: cannot start bootstrap instance
github.com/juju/juju/provider/common/bootstrap.go:50:
github.com/juju/juju/cmd/juju/commands/bootstrap.go:584: failed to bootstrap model

I'm happy to provide more information when needed.